Crosscut-sawing machine



(No Model.) 7 4 Sheets-Sheet 1.

R. S. & R. L. GREENLEE.

V GROSSGUT SAWING MACHINE. No. 419,848. Patented Jan. 21, 1890.

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I! II 4 Sheets--Sheet :2. R. S. 8: R. L. GREENLEE. GROS$CUT SAWINGMAGHINE.

No. 419,848. Patented Jan. 21, 1890.

(No Model.)

(No Model.) 4 Sheets-Sheet 3.

R. S. 82; R. L. GREENLEE.

GROSSOUT SAWING MAGEINE.

No. 419,848. Patented Jan. 21, 1890.

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UNITED STATES ATENT OFFICE.

RALPH S. GREENLEE AND ROBERT L. GREENLEE, OF CHICAGO, ILLINOIS.

CROSSCUT-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 419,848, dated January21, 1890). Application filed March 5, 1889. Serial No. 302,027. {Nomodel.)

To all whom it may concern:

Be it known that we, RALPH S. GREENLEE and ROBERT L. GREENLEE, citizensof the United States, residing at Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inGrosscut-Sawing Machines, of which the following is a specification.

Our invention relates to that class of sawing-machines in which thematerial is placed upon a stationary table and a circular saw havingits, shaft journaled in a traveling carriage is advanced to the work andthen withdrawn while the material is placed in position for thesucceeding operation; and our invention consists in certain devices foroperating the saw and sliding carriage, as hereinafter described, andparticularly pointed out in the claims.

In the drawings, Figure 1 is a plan View of a sawing-machine embodyingour improvements, and fragmentary portions being broken away to showotherwise concealed parts. Fig. 2 is a side elevation of the same. Fig.3 is a vertical section on the line 3 3 of Fig. 1, and Fig. 4 is across-section on line 4 4 of Fig. 1.

5 represents the fram ework of the machine, upon the forward end ofwhich is journaled a driving-shaft 6, having a bandwheel ,7, over whicha belt 8 is carried, said belt being intended to drive the saw 9, whoseshaft is journaled 011 a sliding carriage comprising arched bars 10,having a bearing in suitable ways in the top of the framework, andcrosspieces 11, joining said vertical bars and supporting thereon the journal-boxes for the saw shaft.

12 represents a table on which the material is placed, said table havinga working aperture 13 for the saw. The usual fence lat is provided. Onthe saw-shaft is a belt-pulley 15, and an idler 16 is supported by ashort shaft journaled in hangers forming a part of the travelingcarriage, A pulley 17 is rotatably secured at the rear of theframe-work, and the belt 8 is carried from the band-wheel 7 over theidler 16, around the pulley on the saw-shaft, and thence over the pulley17 at the rear of the machine,

The mechanism for causing the saw-car riage to riciprocate comprises ascrew-threaded shaft 18, which passes through a nut 19, supported by anarm or plate secured to one of the arched bars of the sliding carriage,said worm-shaft having on its end a conical friction driving-wheel 20, arotatable shaft 21, journaled at right angles to the screw-threadedshaft and bearing thereon two conical friction driving-wheels 22 23,said conical driving-wheels being placed a distance apart a littlegreater than the diameter of the wheel 20, and the shaft2l having aslight endwise movement on its bearings, so as to bring the surfaces ofone of the wheels 22 23 into c011- tact with by the endwise movement ofthe shaft 21, and a driving-pulley 24c, keyed on shaft 21. and aroundwhich a belt 25 is carried from a driving-pulley 26 on shaft 6.

The means for reciprocating the shaft 21 comprise a rock-shaft 27,carried in suitable bearings parallel to the screw-threaded shaft andhaving;at its rear end an arm 28, Fig. 1, to which is connected a rod29, the latter be ing pivoted to a fo0t-treadle 30. The forward end ofthe rod 27 has an arm 31, against which a coiled spring 32 is seated,the other end of said spring being confined by a stud 33. Said rod hascrank-arms 34, Figs. 1 and 3, which are pivotally connected to the hubof frictioirgear 22. The rod 27 has adjustable stops 35 thereon, whichare adapted to rock said rod in its bearings whenever they come incontact with the shifting blocks 36, which are supported on an arm 37,depending from the traveling carriage. A detail of this device is shownin Fig. 5.

The travel of the carriage may be varied. by the adjustment of the stops35 on their rod, as it is obvious that when the blocks 36 engage saidstops the shaft 21 will be moved endwise sufficiently to disengage thegearing, and the screwthreaded shaft comes to rest at either end of themovement of the said car riage The operation of the machine is asfollows; Starting from the position shown in Fig. 1,

wherein the screw-threadedshaft gearing is shown disengaged, therotation of shaft 6 i will operate through belt 26 to drive shaft 21,and by means of the belt 8 to put the saw in motion. The treadle 30,being depressed by the foot of the operator, will rock the rod 27 in itsbearings, forcing shaft 21 endwise and bringing the cone-wheel 22 intocontact with the cone-wheel 20 on the end of the screwthreaded shaft,and thus imparting motion to the latter. The rotation of thescrew-threaded shaft causes a movement of the carriage toward the rearend of the machine by reason of the turning of said shaft in the nut 19,which is connected to the carriage. The saw having advanced and severedthe lu ber, the shifting blocks 36 will have reached stop 35 at the rearend of the machine, which will rock rod 27 in its bearings, moving shaft21 .endwise sufficiently to disengage the frictiongear, when the foot israised from the treadle and the spring 32 Will rock the rod 28sufficiently to shift the shaft endwise until the cone-gearing 23 comesin contact with the beveled face of the cone-wheel 20 on thescrew-threaded shaft, whereby the latter is rotated in the oppositedirection, and by means of the nut causes the carriage to return to itsoriginal position.

The belting of this machine is peculiar, the use of the idler permittingthe saw to be driven during the reciprocation of the carriage withoutslackening the belt. XVe regard this feature as novel in a machine ofthis character.

It is obvious that the construction herein shown and described may bevaried within wide limits without departing from the spirit of ourinvention. As, for example, we have shown and described hereinfriction-gear for driving the screw-threaded shaft; but it is obviousthat bevel-toothed gear may be substituted therefor. Ve have alsodescribed and prefer to use a rock-shaft to cause the endwise movementof the gear-shaft; but other equivalent devices may be employed and manysuch will suggest themselves to any mechanic skilled in the art. Aweight connected to an arm of the rock-shaft might be substituted forthe coiled spring shown to .effectthe endwise movement of the gear-shaftin one direction.

We claim- 1. In a sawing-machine, the combination, with a reciprocatingsaw-carriage, of a screwthreaded shaft provided with a friction-gear, arotatable and endWise-movable shaft journaled at right angles to thescrew-threaded shaft and bearing thereon two friction-gears, and arock-shaft adapted to be rocked by the carriage in its reciprocation,and thereby to cause the endwise movement of the shaft bearing the twofriction-gears, whereby to bring them alternately into engagement withthe worm shaft gear, substantially as described.

2. In a sawing-machine, the combination, with a reciprocatingsaw-carriage, of a screwthreaded shaft provided with a friction-gear,a'rotatable and endwise-movable shaft journaled at right angles to thescrew-threaded shaft and bearing thereon two friction-gears, arock-shaft having provisions for moving the shaft bearing the twofriction-gears, and a spring having one end confined and the otherbearing upon an arm of said rock shaft, whereby to rock said shaft inits bearings, substantially as described.

3. In a sawing-machine, the combination, with a reciprocatingsaw-carriage, a screwthreaded shaft enmeshed with a fixed nut on thecarriage, bevel-gearin g to drive said screwthreaded shaft mounted upona rotatable and endwise-movable shaft, and a shifting device to movesaid shaft endwise, comprising a rockshaft having stops adj ustablysecured thereon, and shifting blocks moving with the carriage andadapted to engage said stops at the limits of the movement of thecarriage, Whereby to disengage the screw-threaded-shaf t gearing,substantially as described.

RALPH S. GREENLEE. ROBERT L. GREENLEE.

Witnesses:

FREDERICK C. GOODWIN, O. M. MILLER.

